Office chair



FIG. 1 is a perspective view of an office chair, showing my new design;

FIG. 2 is another perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top plan view thereof;

FIG. 8 is a bottom plan view thereof; and,

FIG. 9 is a partial enlarged view of FIG. 2 . 

CLAIM The ornamental design for a office chair, as shown and described. 